Truss translation device and truss installation method

Abstract

The present invention discloses a truss translation device and a truss installation method. The truss translation device includes a truss main body and a support frame body vertically connected to both ends of the truss main body. The support frame body includes a support bottom beam, a first support column, a second support column, and a travel roller. The two ends of the support bottom beam are fixedly connected to the lower end of the first support column and the lower end of the second support column, respectively. The upper end of the first support column and the upper end of the second support column are connected in an inverted V shape. Travel rollers are provided at the bottom of the support bottom beam. One or more lifting points are provided on the lower side of the truss main body, and an electric hoist is provided at each lifting point. The present invention utilizes a steel truss translation device to assemble the truss main body piece by piece from its initial position in the order specified in the plan, and then translate it to the installation position for installation. The present invention can quickly assemble and translate the truss to the installation position in a site with a small lifting capacity and a narrow construction area, thereby reducing the difficulty of installing the truss structure in place.

Description

Technical Field

[0001] The present invention relates to the technical field of steel truss construction equipment, and in particular to a truss translation device and a truss installation method. Background Art

[0002] With the rapid and steady growth of China's economic development, the number of large-span spatial structures has continued to increase, and the types and forms of large-span spatial structures are extremely diverse. This is due to the substantial increase in my country's steel production and the continuous development and utilization of new materials. More and more buildings are adopting steel truss structures. For example, they are often used in large-span public buildings such as factories, exhibition halls, gymnasiums, and bridges. Therefore, steel truss structures have a broad market prospect and high added value. However, during the construction of steel truss buildings, the prefabricated steel truss structures are generally transported to the construction site for assembly after the main concrete structure is completed. Each steel truss structure typically has a large span, ranging from 20 to 40 meters. However, due to the large number of weld points and the structural defects of the truss structure, the steel truss has high in-plane stiffness but low out-of-plane stiffness. Moreover, the longer the in-plane truss, the greater the deflection. This increases the uneven deformation of the components during the lifting process, making construction more difficult, lowering work efficiency, and relatively low reliability. For some old city buildings surrounded by residential areas, the lifting capacity is small and the construction area is narrow. Conventional lifting methods are not applicable, which makes the installation of the truss structure more difficult. How to protect the concrete roof from structural damage and destruction during the lifting and installation process is an unavoidable problem. Therefore, it is of great practical significance to study how to use the steel truss translation device to quickly, efficiently and safely complete the installation task of the main truss and secondary beams under the existing narrow lifting space environment conditions. Summary of the Invention

[0003] The purpose of the present invention is to provide a truss translation device and truss installation method. The present invention can quickly assemble and translate the steel main truss and secondary beam truss to the installation position in sites with low lifting loads and narrow construction areas, and perform fast, efficient and safe installation. Not only can it be accurately moved to the designated installation position, but it is also stable, reliable, flexible, and safe, reducing the difficulty of installing the truss structure in place. To achieve the above purpose, the present invention adopts the following technical effects:

[0004] According to one aspect of the present invention, a truss translation device is provided, which includes a truss translation device and a support frame body vertically connected to both ends of the truss body, the support frame body including a supporting bottom beam, a first supporting column, a second supporting column and a walking roller, the two ends of the supporting bottom beam are fixedly connected to the lower end of the first supporting column and the lower end of the second supporting column respectively, the upper end of the first supporting column and the upper end of the second supporting column are connected in an inverted V shape, walking rollers are arranged at the bottom of the supporting bottom beam, one or more lifting points are arranged on the lower side of the truss body, and an electric hoist is arranged at each lifting point.

[0005] The above scheme is further preferred, in which a positioning support beam parallel to the support bottom beam is provided below the connection between the upper end of the first support column and the upper end of the second support column, and the two ends close to the positioning support beam are respectively connected to the inner wall between the first support column and the second support column, so that a placement space is formed between the positioning support beam and the connection between the upper end of the first support column and the upper end of the second support column, the upper side of the truss body is provided on the surface of the connection between the upper end of the first support column and the upper end of the second support column, and the lower side of the truss body is provided on the positioning support beam.

[0006] The above scheme is further preferred, and a support platform is provided at the top of the placement space and between the upper end of the first support column and the connection between the upper end of the second support column, and the two sides of the support platform are connected to the inner side of the upper end of the first support column and the inner side of the upper end of the second support column, so that the surface of the support platform and the inner side of the upper end of the first support column and the inner side of the upper end of the second support column form a placement groove.

[0007] The above scheme is further preferred in that a third support column is vertically arranged between the middle part of the positioning support beam and the supporting bottom beam, and a pull rod connected horizontally or obliquely is arranged between the third support column and the first support column and between the third support column and the second support column. The two ends of the positioning support beam extend outward along the two ends of the first support column and the second support column respectively, and the extended length is 20cm-40cm.

[0008] The above scheme is further preferred in that the truss body is formed by connecting two or more mutually detachable trusses, and each truss section includes an upper chord, a lower chord and a truss support section. Truss support sections are arranged between the upper chord and the lower chord and in sequence from the head end to the tail end. The upper and lower ends of the truss support section are respectively connected to the upper chord and the lower chord, and the two ends of the upper chord are respectively arranged on the surface of the connection between the upper end of the first support column and the upper end of the second support column, and the two ends of the lower chord are respectively arranged on the positioning support beam.

[0009] The above scheme is further preferred, in that two symmetrical upper angle steel support arms and lower angle steel support arms are laterally arranged every 2m-3.5m on the upper and lower sides of the outer wall of the upper chord and the upper and lower sides of the outer wall of the lower chord, and the ends of the upper angle steel support arms and the ends of the lower angle steel support arms are connected by rectangular pipe clamps, and first connecting rods are respectively connected between the lower angle steel support arms and the truss support sections arranged on both sides of the upper chord, and between the upper angle steel support arms and the truss support sections arranged on both sides of the lower chord.

[0010] The above solution is further preferred in that the upper angle steel support arm and the lower angle steel support arm are angle steels of L80×6 and 0.9m in length, and the rectangular pipe clamps are rectangular clamps of RHS200×14 and 250mm in length.

[0011] The above scheme is further preferred, in which walking brackets are fixedly laid between the upper angle steel support arms and the lower angle steel support arms adjacent to each other on both sides of the upper chord and between the upper angle steel support arms and the lower angle steel support arms (14) adjacent to each other on both sides of the lower chord, and the walking brackets are connected to the rectangular pipe clamps, and a second connecting rod is connected between the walking brackets and the adjacent truss support sections.

[0012] The above solution is further preferred in that baffles are provided on both sides of the rolling travel of the travel roller, and movable hooks are provided at both ends of the supporting bottom beam.

[0013] According to another aspect of the present invention, a truss installation method using a truss translation device of the present invention comprises the following steps:

[0014] Step 1: Analyze and calculate the stress conditions of the truss body to obtain the specifications of the truss body so that the truss body meets the strength requirements. Lay two parallel guide rails on the building roof for the running rollers, and symmetrically set the support frame between the two parallel running rollers. Hoist each truss section onto the support frame and connect each truss section to form the truss body.

[0015] Step 2: Fix the upper chord of the truss body on the support platform between the upper end of the first support column and the connection point of the upper end of the second support column, and at the same time connect the upper chord of the truss body to the placement groove of the support platform, and connect the lower chord of the truss body to the positioning support beam, so that the two ends of the truss body are respectively located in the placement space, and the support frame can move back and forth on the guide rail along with the walking roller;

[0016] Step 3: Hoist the pre-laid first truss onto the roof, adjust the horizontal and vertical positions of the first truss by using the electric hoist installed at each hoisting point on the lower side of the truss body, and then assemble the first truss;

[0017] Step 4: Use the winch to pull the movable hook on the supporting bottom beam, so that the entire support frame moves on the guide rail through the walking roller, and move the assembled first truss to the pre-installed roof position, unload the first truss to the roof installation position, pull the support frame again and drive the truss body to move back to the starting position.

[0018] Step 5: Repeat step 3 until the installation of the second to last truss is completed, then remove the truss body from the support frame and install it as the last truss at the corresponding position on the roof.

[0019] In summary, the present invention adopts the above technical solution, and the present invention has the following technical effects:

[0020] (1) The truss translation device of the present invention can quickly assemble and translate the steel main truss and secondary beam truss to the installation position in a site with a small lifting weight and a narrow construction area, and can quickly, efficiently and safely install them in place. It can not only accurately move to the designated installation position, but also be stable, reliable, flexible and safe, reducing the difficulty of installing the truss structure in place, and can effectively protect the concrete roof from structural damage and destruction during the lifting and installation process.

[0021] (2) The translation device of the present invention can ensure the overall stability of the truss body and the rigidity of the truss. The construction method is easy to operate, which greatly improves the project progress and construction speed, ensures the reliability and quality of construction installation, effectively improves the efficiency of truss installation operations, shortens the action cycle, and can effectively save manpower and material resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of a truss translation device of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the support frame of the present invention;

[0024] Figure 3 It is a schematic diagram of the top installation structure of the support frame of the present invention;

[0025] Figure 4 It is a structural schematic diagram of the truss body of the present invention;

[0026] Figure 5 It is a schematic diagram of the installation structure of the steel support arm and the rectangular pipe clamp of the present invention;

[0027] In the accompanying drawings, there are a truss body 1, a support frame 2, a lifting point 3, an upper chord 10, a lower chord 11, a truss support section 12, an upper angle steel support arm 13, a lower angle steel support arm 14, a rectangular pipe clamp 15, a first connecting rod 16, a walking bracket 17, a second connecting rod 18, a support bottom beam 20, a first support column 21, a second support column 22, a walking roller 23, a baffle 23a, a movable hook 23b, a positioning support beam 24, a placement space 25, a support platform 26, a placement groove 27, a third support column 28, a pull rod 29, and an electric hoist 30. DETAILED DESCRIPTION

[0028] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and by way of preferred embodiments. However, it should be noted that many of the details listed in this specification are merely provided to help the reader gain a thorough understanding of one or more aspects of the present invention, and these aspects of the present invention can be practiced even without these specific details.

[0029] Combine Figure 1 and Figure 2 As shown, according to a truss translation device of the present invention, the truss translation device includes a truss body 1 and a support frame body 2 vertically connected to both ends of the truss body 1, the support frame body 2 includes a support bottom beam 20, a first support column 21, a second support column 22 and a walking roller 23, the two ends of the support bottom beam 20 are respectively fixedly connected to the lower end of the first support column 21 and the lower end of the second support column 22, the upper end of the first support column 21 and the upper end of the second support column 22 are connected in an inverted V shape, a walking roller 23 is provided at the bottom of the support bottom beam 20, and one or more lifting points are provided on the lower side of the truss body 1. 3. An electric hoist 30 is provided at each lifting point 3. Each truss is lifted by the electric hoist 30 and moved and adjusted in position on the truss translation device. Baffles 23a are provided on both sides of the rolling travel of the walking roller 23. The baffles 23a limit the travel roller 23 during its travel to prevent the travel roller 23 from derailing during its rolling process. Moving hooks 23b are respectively provided at both ends of the supporting bottom beam 20. The steel wire rope of the winch is used to connect the moving hooks 23b. The winch pulls the moving hooks 23b to make the support frame 2 travel on the guide rails laid on the building roof through the walking roller 23.

[0030] In the present invention, combined with Figure 1 and Figure 3As shown, a positioning support beam 24 parallel to the support bottom beam 20 is provided below the connection between the upper end of the first support column 21 and the upper end of the second support column 22, and the two ends close to the positioning support beam 24 are respectively connected to the first support column 21 and the second support column 22, so that a placement space 25 is formed between the horizontal upper part of the positioning support beam 24 and the connection between the upper end of the first support column 21 and the upper end of the second support column 22, and the two ends of the positioning support beam 24 respectively extend outward along the two ends of the first support column 21 and the second support column (22) for a distance, and the length of the two ends of the positioning support beam 24 extending outward is 20cm-40cm. The upper side of the truss body 1 is provided on the surface of the connection between the upper end of the first support column 21 and the upper end of the second support column 22, and the lower side of the truss body 1 It is arranged on the positioning support beam 24; a support platform 26 is provided between the top of the placement space 25 and the connection between the upper end of the first support column 21 and the upper end of the second support column 22, and the two sides of the support platform 26 are connected with the inner side of the upper end of the first support column 21 and the inner side of the upper end of the second support column 22, so that the surface of the support platform 26 and the inner side of the upper end of the first support column 21 and the inner side of the upper end of the second support column 22 form a placement groove 27, and the upper sides of the two ends of the truss body 1 are respectively installed in the placement groove 27 at the top end of the support frame body 2 on the corresponding side, and the lower sides of the two ends of the truss body 1 are respectively placed in the placement space 25 on the corresponding side, and the two ends of the truss body 1 can be appropriately moved back and forth on the positioning support beam 24, so that the two ends of the truss body 1 can be effectively limited and fixed.

[0031] In the embodiment of the present invention, Figure 1 and Figure 3 As shown, a third support column 28 is vertically arranged between the middle part of the positioning support beam 24 and the supporting bottom beam 20, and a pull rod 29 is provided between the third support column 28 and the first support column 21 and between the third support column 28 and the second support column 22 in a horizontal or inclined connection. The pull rod 29 not only provides effective support strength between the first support column 21 and the second support column 22, but also stabilizes and fixes the third support column 28.

[0032] In the embodiment of the present invention, Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown, the truss body 1 is formed by connecting two or more mutually detachable trusses, and each truss section includes an upper chord 10, a lower chord 11 and a truss support section 12. Truss support sections 12 are arranged between the upper chord 10 and the lower chord 11 and in sequence from the head end to the tail end. The upper and lower ends of the truss support section 12 are respectively connected to the upper chord 10 and the lower chord 11, so that the truss support section 12 is vertically or obliquely connected to the upper chord 10 and the lower chord 11. Three lifting points 3 are arranged below the lower chord 11, and an electric hoist 30 is installed at each lifting point. The truss support section 12 is vertically or / and obliquely connected between the upper chord 10 and the lower chord 11, thereby forming each truss main frame. After each truss main frame is assembled to form the truss main body 1, the two ends of the upper chord 10 are respectively arranged at the upper end of the first support column 21 and the upper end of the second support column 22. On the surface of the joint, the two ends of the lower chord 11 are respectively arranged on the positioning support beam 24, and the two ends of the upper chord 10 of the truss body 1 are respectively installed in the placement groove 27 of the support platform 26 on the corresponding side, and connecting screw holes are provided in the placement groove 27, so that the upper chord 10 can be conveniently connected to the placement groove 27 formed between the upper end of the first support column 21 and the upper end of the second support column 22 by bolts, thereby quickly and effectively limiting and fixing the upper chord 10, and the two ends of the lower chord 11 of the truss body 1 are respectively installed in the narrow placement space 25 above the positioning support beam 24 on the corresponding side, so that the truss body 1 can be effectively limited and fixed in the positioning support beam 24, reducing the torsional offset on both sides of the truss body 1, and improving the stability of the truss translation process, thereby protecting the truss from or minimizing collision with the concrete roof during translation, lifting and installation, thereby preventing or minimizing structural damage and destruction.

[0033] In the embodiment of the present invention, Figure 1 、 Figure 4 and Figure 5As shown, two symmetrical upper angle steel support arms 13 and lower angle steel support arms 14 are transversely arranged at intervals of 2m-3.5m on the upper and lower sides of the outer wall of the upper chord 10 and the upper and lower sides of the outer wall of the lower chord 11. The ends of the upper angle steel support arms 13 and the ends of the lower angle steel support arms 14 are connected by rectangular pipe clamps 15. First connecting rods 16 are respectively connected between the lower angle steel support arms 14 and the truss support sections 12 arranged on both sides of the upper chord 10 and between the upper angle steel support arms 13 and the truss support sections 12 arranged on both sides of the lower chord 11. The upper angle steel support arms 13 and the lower angle steel support arms 14 are L80×6 and 0. 9m angle steel, rectangular pipe clamp 15 adopts RHS200×14, rectangular clamp with a length of 250mm, and a walking bracket 17 is fixedly laid between the upper angle steel support arm 13 and the lower angle steel support arm 14 adjacent to each other on both sides of the upper chord 10 and between the upper angle steel support arm 13 and the lower angle steel support arm 14 adjacent to each other on both sides of the lower chord 11. The walking bracket 17 is connected to the rectangular pipe clamp 15, and a second connecting rod 18 is connected between the walking bracket 17 and the adjacent truss support section 12, and the lower surface of the walking bracket 17 is fixedly connected to the upper surface of the lower angle steel support arm 14, and the upper surface of the walking bracket 17 is fixedly connected to the upper angle steel support arm 13 is fixedly connected, and the walking bracket 17 can also be directly fixed between the surfaces of the adjacent upper angle steel support arms 13 or the surfaces of the adjacent lower angle steel support arms 14. An angle steel support arm with a width of 0.9m and L80×6 is welded and installed every 2m-3.5m on the upper and lower surfaces of the upper chord 10 of the truss body 1 and the upper and lower outer walls of the lower chord 11. A 250mm long RHS200×14 rectangular pipe clamp is symmetrically set on both sides of the chord every 3 meters, so that the angle steel support arm and the rectangular pipe clamp are welded and fixed to the chord, and at the same time, the angle steel support arm and the corresponding chord are stabilized and strengthened by the first connecting rod 16. In terms of support strength, since the truss span is large, generally about 30m, under the action of inertia force when stationary and starting / stopping, the structural out-of-plane stiffness of most trusses is insufficient. In order to ensure the out-of-plane stiffness of the structure as a whole, the traveling bracket 17 is laid on the angle steel support arms of the upper and lower chords, and the second connecting rod 18 is connected between the traveling bracket 17 and the truss support section 12. At the same time, fixed connecting plates 16a connected to the traveling bracket 17 can be respectively provided at the corresponding positions of the upper chord 10 and the lower chord 11, so as to further reinforce the angle steel support arms, thereby further improving the support strength and stiffness of the truss body 1.

[0034] According to another aspect of the present invention, Figure 1 、 Figure 2 and Figure 4As shown, the method or process of installing a truss using a truss translation device of the present invention includes the following steps: mainly, all main truss components are prefabricated in the factory and shipped to the construction site in two sections, and the truss body 1 is assembled piece by piece from the initial position according to the sequence specified in the plan using the steel truss translation device and then translated to the installation position for installation;

[0035] Step 1: Analyze and calculate the stress of the truss body 1, obtain the specification parameters of the truss body 1, and make the truss body 1 meet the strength requirements. The truss body 1 is made of Q235 steel with an elastic modulus of 2.06×105N / mm 2 ; Poisson's ratio: 0.30; Linear expansion coefficient: 1.20×10 -5 ;Mass density:7850kg / m 3 According to the above parameters, a model is established in 3D3S to analyze and calculate the internal force and displacement of the truss body 1, and relevant parameters such as overall stability, shear stress ratio and slenderness ratio are obtained. Two parallel guide rails for the running rollers 23 are laid on the roof of the building, and the support frame 2 is hoisted to the corresponding running rails, so that the support frame 2 is symmetrically arranged between the two parallel guide rails, and the support frame 2 is rolled on the guide rails by the running rollers (23); then each truss section is connected to each other to form the truss body 1 and the spliced ​​truss body 1 is hoisted to the support frame 2;

[0036] Step 2: Fix the upper chord 10 of the truss body 1 on the support platform 26 between the upper end of the first support column 21 and the upper end of the second support column 22, and at the same time connect the upper chord 10 of the truss body 1 to the placement groove 26 of the support platform 26, and connect the lower chord 11 of the truss body 1 to the positioning support beam 24, so that the two ends of the truss body 1 are respectively located in the placement space 25, and the support frame 2 can move back and forth on the guide rail along with the walking roller 23;

[0037] Step 3: Hoist the pre-laid first truss onto the roof (the spliced ​​truss can be hoisted onto the roof or can be assembled on the roof by hanging it on the truss body 1 through the electric hoist 30), pull the pre-laid first truss through the electric hoist 30 installed at each hoisting point 3 on the lower side of the truss body 1, adjust the horizontal and vertical positions of the first truss, and then firmly place the first truss in the placement groove 27 and the placement space 25 formed between the positioning support beam 24 and the upper end of the first support column 21 and the upper end of the second support column 22;

[0038] Step 4: Use a winch to pull the movable hook 23b on the supporting bottom beam 20, so that the entire support frame 2 moves on the guide rail through the walking roller 23, and the assembled first truss is moved to the pre-installed roof position. The first truss is unloaded to the roof installation position, the verticality of the first truss is adjusted, and its lateral bending is checked. The first truss is temporarily fixed, and the support frame 2 is pulled again to drive the truss body 1 to move back to the starting position.

[0039] Step 5: Repeat steps 3 to 4 until the penultimate truss is completed, so that each adjacent truss forms a spatially stable whole, and at the same time, calibrate the truss and the roof. The truss is installed on the concrete beam foundation of the roof. Before installation, the anti-fall rope on the truss body 1 should be hung on the predetermined anchor bolt position and tied firmly. After the truss is hoisted into place, it should be temporarily fixed on the anchor bolt to facilitate the correction of verticality. After the installation and adjustment are completed, the truss body 1 is finally removed from the support frame 2 and installed as the last truss on the corresponding position of the roof.

[0040] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A truss installation method, characterized in that: The truss installation method utilizes a truss translation device for installation, the truss translation device comprises a truss body (1) and a support frame body (2) vertically connected to both ends of the truss body (1), the support frame body (2) comprises a support bottom beam (20), a first support column (21), a second support column (22) and a walking roller (23), the two ends of the support bottom beam (20) are respectively fixedly connected to the lower end of the first support column (21) and the lower end of the second support column (22), the upper end of the first support column (21) and the upper end of the second support column (22) are connected in an inverted V shape, a walking roller (23) is provided at the bottom of the support bottom beam (20), one or more lifting points (3) are provided on the lower side of the truss body (1), and an electric hoist (30) is provided at each lifting point (3); baffles (23a) are provided on both sides of the rolling travel of the walking roller (23), and movable hooks (23b) are provided at both ends of the support bottom beam (20). A positioning support beam (24) parallel to the support bottom beam (20) is provided below the connection between the upper end of the first support column (21) and the upper end of the second support column (22), and the two ends of the positioning support beam (24) are respectively connected to the first support column (21) and the second support column (22), so that a placement space (25) is formed between the positioning support beam (24) and the connection between the upper end of the first support column (21) and the upper end of the second support column (22). The upper side of the truss body (1) is provided on the surface of the connection between the upper end of the first support column (21) and the upper end of the second support column (22), and the lower side of the truss body (1) is provided on the positioning support beam (24); a support is provided between the top of the placement space (25) and the connection between the upper end of the first support column (21) and the upper end of the second support column (22). A platform (26), the two sides of which are connected to the inner side of the upper end of the first support column (21) and the inner side of the upper end of the second support column (22), so that a placement groove (27) is formed between the surface of the support platform (26) and the inner side of the upper end of the first support column (21) and the inner side of the upper end of the second support column (22); a third support column (28) is vertically arranged between the middle part of the positioning support beam (24) and the supporting bottom beam (20), and a pull rod (29) connected horizontally or obliquely is arranged between the third support column (28) and the first support column (21) and between the third support column (28) and the second support column (22), and the two ends of the positioning support beam (24) extend outward along the two ends of the first support column (21) and the second support column (22), and the extended length is 20cm-40cm; The truss body (1) is formed by connecting two or more mutually detachable trusses, each truss section includes an upper chord (10), a lower chord (11) and a truss support section (12), and the truss support sections (12) are arranged between the upper chord (10) and the lower chord (11) and are sequentially spaced from the head end to the tail end. The upper and lower ends of the truss support section (12) are respectively connected to the upper chord (10) and the lower chord (11); The truss installation method includes the following steps: Step 1: Analyze and calculate the stress condition of the truss main body (1), obtain the specification parameters of the truss main body (1), and make the truss main body (1) meet the strength requirements. The truss main body (1) is made of Q235 steel with an elastic modulus of 2.06×105N / mm 2 , Poisson's ratio is 0.30, and the linear expansion coefficient is 1.20×10 -5 , mass density is 7850kg / m 3 and laying two mutually parallel guide rails for the running rollers (23) on the roof of the building, hoisting the support frame (2) onto the corresponding running rails, thereby symmetrically arranging the support frame (2) between the two parallel guide rails; then connecting each truss section to form a truss body (1) and hoisting the spliced ​​truss body (1) onto the support frame (2); Step 2: Fix the upper chord (10) of the truss body (1) on the support platform (26) between the upper end of the first support column (21) and the upper end of the second support column (22), and at the same time connect the upper chord (10) of the truss body (1) to the placement groove (27) of the support platform (26), and connect the lower chord (11) of the truss body (1) to the positioning support beam (24), so that the two ends of the truss body (1) are respectively located in the placement space (25), and the support frame (2) can move back and forth on the guide rail along with the walking roller (23); Step 3: Hoist the pre-laid first truss onto the roof, and pull the pre-laid first truss by means of an electric hoist (30) installed at each hoisting point (3) on the lower side of the truss body (1), adjust the horizontal and vertical positions of the first truss, and then firmly place the first truss in the placement groove (27) and the placement space (25) formed between the positioning support beam (24) and the upper end of the first support column (21) and the upper end of the second support column (22); Step 4: Using a winch to pull the movable hook (23b) on the supporting bottom beam (20), the entire supporting frame (2) moves on the guide rail via the walking roller (23), and the assembled first truss is moved horizontally to the pre-installed roof position, and the first truss is unloaded to the roof installation position, and the supporting frame (2) is pulled again to drive the truss body (1) to move horizontally back to the starting position; Step 5: Repeat steps 3 to 4 until the installation of the second to last truss is completed, then remove the truss body (1) from the support frame (2) and install it on the corresponding position of the roof as the last truss.

2. A truss installation method according to claim 1, characterized in that: The two ends of the upper chord (10) are respectively arranged on the surface of the connection between the upper end of the first support column (21) and the upper end of the second support column (22), and the two ends of the lower chord (11) are respectively arranged on the positioning support beam (24). The two ends of the upper chord (10) are respectively installed in the placement groove (27) of the support platform (26) on the corresponding side. A connecting screw hole is provided in the placement groove (27) to facilitate the upper chord (10) to be connected to the placement groove (27) formed between the upper end of the first support column (21) and the upper end of the second support column (22) by bolts, thereby quickly and effectively limiting and fixing the upper chord (10).

3. A truss installation method according to claim 1 or 2, characterized in that: Two symmetrical upper angle steel support arms (13) and lower angle steel support arms (14) are transversely arranged at intervals of 2m-3.5m on the upper and lower sides of the outer wall of the upper chord (10) and the upper and lower sides of the outer wall of the lower chord (11). The ends of the upper angle steel support arms (13) and the ends of the lower angle steel support arms (14) are connected by rectangular pipe clamps (15). First connecting rods (16) are respectively connected between the lower angle steel support arms (14) and the truss support sections (12) arranged on both sides of the upper chord (10) and between the upper angle steel support arms (13) and the truss support sections (12) arranged on both sides of the lower chord (11).

4. A truss installation method according to claim 3, characterized in that: The upper angle steel support arm (13) and the lower angle steel support arm (14) are angle steels with a length of L80×6 and a length of 0.9m, and the rectangular pipe clamp (15) is a rectangular clamp with a length of RHS200×14 and a length of 250mm.

5. A truss installation method according to claim 4, characterized in that: A walking bracket (17) is fixedly laid between the upper angle steel support arms (13) and the lower angle steel support arms (14) adjacent to each other on both sides of the upper chord (10) and between the upper angle steel support arms (13) and the lower angle steel support arms (14) adjacent to each other on both sides of the lower chord (11), and the walking bracket (17) is connected to the rectangular pipe clamp (15). A second connecting rod (18) is connected between the walking bracket (17) and the adjacent truss support section (12). The lower surface of the walking bracket (17) is fixedly laid between the upper angle steel support arms (13) and the lower angle steel support arms (14). It is fixedly connected to the upper surface of the lower angle steel support arm (14), and the upper surface of the walking bracket (17) is fixedly connected to the lower surface of the upper angle steel support arm (13). An angle steel support arm with a width of 0.9m and L80×6 is welded and installed at intervals of 2m-3.5m on the upper and lower surfaces of the upper chord (10) of the truss body (1) and the upper and lower outer walls of the lower chord (11). A 250mm long RHS200×14 rectangular pipe clamp is symmetrically set on both sides of the chord every 3 meters.

6. A truss installation method according to claim 1, characterized in that: Baffles (23a) are provided on both sides of the rolling travel of the travel roller (23), and movable hooks (23b) are respectively provided on both ends of the supporting bottom beam (20).

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